I believe I mentioned it in a previous post here or I intended to and didn't follow through, but I would argue the PF spam as more obstructive than the shout chat advertisements. However, I am rarely in the city states for long periods of time so maybe I just don't see them. I do know the shouts tend to get more active when the venues are close to opening, and since everyone decided to do it on the weekend the traffic can increase there but usually the chat is quiet outside of advertisements whether it be for venues or FCs.